Secondary battery, method for manufacturing the secondary battery, and battery module including the secondary battery

A secondary battery comprising:

• an electrode assembly;
• a sheet-like exterior configured to accommodate the electrode assembly;
• and
• a plurality of temperature sensing units provided to be inserted into the exterior and each configured to sense a temperature of a respective area of the exterior,
• wherein the exterior comprises:
• an inner body part configured to define an inner body of the exterior;
• an insulating film attached on the inner body part to define an outer surface of the exterior, the insulating film having electrical insulation, and the insulating film covering the plurality of temperature sensing units,
• wherein the insulating film comprises:
• a first insulating film attached on the inner body part of the exterior, configured to wrap circumferences of the plurality of temperature sensing units and the first insulating film having through-holes defined in positions at which the plurality of temperature sensing units are disposed such that each one of the plurality of temperature sensing units is received in a respective one of the through-holes, respectively;
• and
• a second insulating film attached to a surface of an upper portion of the first insulating film to cover the plurality of temperature sensing units and the through-holes in which the plurality of temperature sensing units are received,
• wherein one or more of the plurality of temperature sensing units comprise:
• a positive temperature coefficient element;
• and
• a negative temperature coefficient element, and
• wherein the plurality of temperature sensing units are attached to the inner body part.